NAVIGATION SYSTEM (for HDD), Diagnostic DTC:B1591, B15D1

DTC Code DTC Name
B1591 No Response from Audio HU
B15D1 Audio HU Disconnected

DESCRIPTION

The navigation computer sub-assembly and radio receiver assembly are connected by the MOST communication line.

When a MOST communication error occurs between the navigation computer sub-assembly and radio receiver assembly, these DTCs will be stored.

DTC No. DTC Detection Condition Trouble Area
B1591 No response to the diagnostic memory request from the master unit.

  • Radio receiver assembly power source circuit

  • MOST circuit between navigation computer sub-assembly and radio receiver assembly

  • MOST circuit between radio receiver assembly and stereo component amplifier assembly

  • Radio receiver assembly

  • Navigation computer sub-assembly
B15D1 A device that is listed in the MOST network connected device record of the master unit is missing.

Tech Tips

For the MOST network, the navigation computer sub-assembly is the master unit.

WIRING DIAGRAM

A003YE1E02

INSPECTION PROCEDURE

Note


  • When replacing the navigation computer sub-assembly, perform vehicle contract setting (w/ G-BOOK System) Click here.

  • Inspect the fuse for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)


    1. Check for optional components.


      1. Check that optional components (including associated wiring) which generate radio waves are not installed.

        Result
        Result Proceed to
        Optional components (including associated wiring) are installed. A
        Optional components (including associated wiring) are not installed. B

        Tech Tips


        • Electrical noise from radio waves generated by optional components or the wiring for those components may affect MOST communication.

        • This DTC may be stored when a MOST communication error occurs due to electrical noise.


    B

    CHECK DTC Click here

    A

  2. REMOVE OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)


    1. Remove optional components (including associated wiring).

      Note

      Do not remove optional components or associated wiring without the permission of the customer.


    NEXT

  3. CHECK DTC


    1. Clear the DTCs Click here.

    2. Recheck for DTCs and check if the same DTCs are output again.

      OK
      No DTCs are output.

    NG

    CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY POWER SOURCE) Click here

    OK

    END

  4. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY POWER SOURCE)


    1. Disconnect the H50 radio receiver assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H50-15 (GND) - Body ground Always Below 1 Ω

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      H50-14 (B) - H50-15 (GND) Power switch off 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR


    1. Disconnect the H50 radio receiver assembly connector.

    2. Disconnect the H62 navigation computer sub-assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H50-9 (MI+) - H62-3 (MO+) Always Below 1 Ω
      H50-23 (MI-) - H62-7 (MO-) Always Below 1 Ω
      H50-10 (SLDI) - H62-6 (SLDO) Always Below 1 Ω
      H50-9 (MI+) - Body ground Always 10 kΩ or higher
      H50-23 (MI-) - Body ground Always 10 kΩ or higher
      H50-10 (SLDI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR


    1. Disconnect the H50 radio receiver assembly connector.

    2. Disconnect the H56 stereo component amplifier assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H50-11 (MO+) - H56-4 (MI+) Always Below 1 Ω
      H50-25 (MO-) - H56-10 (MI-) Always Below 1 Ω
      H50-24 (SLDI) - H56-5 (SLDI) Always Below 1 Ω
      H50-11 (MO+) - Body ground Always 10 kΩ or higher
      H50-25 (MO-) - Body ground Always 10 kΩ or higher
      H50-24 (SLDI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. REPLACE RADIO RECEIVER ASSEMBLY


    1. Replace the radio receiver assembly Click here.

    2. Clear the DTCs Click here.

    3. Recheck for DTCs and check if the same DTCs are output again.

      OK
      No DTCs are output.

    NG

    REPLACE NAVIGATION COMPUTER SUB-ASSEMBLY Click here

    OK

    END